Butterfly chair



FIG. 1 is a front and left side perspective view of a butterfly chair in accordance with my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines in the figures are for the purpose of showing environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a butterfly chair, as shown and described. 